Grinding or polishing wheel.



P. N. & P. E. GARDNER A. M. GARDNER, EXEOUTRIX OF I. N. GARDNER, DEOD.

GRINDING 0R POLISHING WHEEL. APPLICATION rum) MAR. 27, 1913.

1,107,512, i Patented Aug 18, 19M,

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rnribnmoir a; Gliainvntt AND 4 stances or ONE-THIRD rotourswanzooTHOMPSON,

x or sen ,ALrcE 1vr. eann vnit Exponent To (171 whom it may concern I Iv 1 Be it known that we, FREDERICK N. GARD- ma: and Furniture-"E.GARDNER, citizens of the United States, residing at Beloit, in thecounty of Rock and State of \Visconsimhave invented certain new anduseful Improve ments in Grinding or Polishing'lVheels, of which thefollowing is a specification.

This invention relates to wheels which are used upon grinding orpolishing machines, and theobject of the invention is to provide animproved means for tightly securing the grinding or polishing band uponthe periphery of the wheel.

In the-accompanying drawings, Figure 1 is a side elevation of a wheelembodying the features of our invention. Fig. 2 is a section on line 2 2of Fig. 1. Figs-3 is a frag mental detail View illustrating the loop ofthe band which is drawn down into the slot in the wheel, the joint inthe band being formed in this portion.

The wheel comprises the usualhub 5, radial web 6 and peripheral flange7. A slot 8 extends inwardly through the flange 7 and continues somewhat'wider in the web 6. Preferably, a layer 9 of suitable material, such ascanvas, is placed upon the periphery of the flange 7, the ends of saidlayer terminating at the edges of the slot 8. The grinding or polishingband 10 extends about the periphery of the layer 9. The band 10 is madeof greater diameter than the wheel, and the excess of material in theband is drawn down through the slot 8 in the flange 7 to form a loop 11.This loop in the band includes the joint formed between the ends 10 ofthe strip of which the band is composed. Said ends are overlapped andsuitably secured together, as by means of adhesive material, theabrasive material having been previously removed from said ends. Theseoverlapping ends 10 provide a double thickness of material in the loop11. In order to draw the band 10 tightly about the periphery of thewheel, means is provided to exert tension upon the loop 11 toward thecenter of the wheel.

A cross pin 12 lies in the lower end'of the loop 11, said pin preferablyhaving flanges 13 at its ends to overlie the edges of the material ofthe loop. An eye-bolt 14 has an eye 15 therein through which the pin 12extends The overlapping ends 10 of the I or BELOI'D, WISCONSIN; FRED RICN. GARDNER, DECEASED.

GRINDING on Pomsnnvs i'wHEEL.

Specification'of Ljctters Patentv =Pate1'1tedAugt-18, 1 914..Appliication fiied March 27, 1913. Seria1Noi757J28 a band at the bottomof the loop 11have a is lotv 16 therein to accommodate the endof thebolt 14. Said bolt extends downwardly through an opening in the top wallof a hollow boss 17 which is formed integral with the web 6 of the wheelat the lower end of the slot 8. A slot 18 in the Web 6 continuesinwardly from the boss 17, and the bolt 14 projects through said bossand into the slot 18. The inner end of the bolt is screw threaded, and anut 19 is turned on said threaded end, said nut having a plurality ofrecesses 20 in its periphery adapted to receive a suitable implement forturning the nut. A coiled compression spring 21 surrounds the innerportion of the bolt 14, one end of said spring bearing against the nut19 and said spring extending into the hollow boss 17 and having itsopposite end bearing against the end Wall of said boss. The spring 21tends to draw the loop 11 inwardly and thus exerts continuous tensionupon the band 10 to draw it tightly about the periphery of the wheel.The tension of the spring may be adjusted by turning the nut 19.

It has been found that variations in temperature and humidity willsometimes cause the abrading band to shrink or expand. As will be seen,in the construction herein disclosed this shrinkage or expansion of theband will be automatically taken care of by the spring 21, so that theband will be maintained tight upon the pulley under all conditions.

e claim as our invention:

1'. The combination of a grinding wheel having a slot extending inwardlyfrom its periphery, a grinding band fitting upon said periphery andhaving a portion extending into said slot, a bolt operatively connectedto said portions. and a coiled spring tending to draw said bolt inwardlyto maintain said grinding band tight upon the wheel, said bolt beingscrew-threaded whereby adjustment may be made to vary the tension ofsaid spring.

2. The combination of a grinding wheel having a slot extending inwardlyfrom its periphery, a grinding band fitting upon said periphery andhaving a loop extending into said slot, a cross pin in said loop, a boltengaging said cross pin and extending through a part on said wheel, anut threaded on said neonate GAR-Dunner BELOIT, Wisconsin, 1113- bolt,and a coiled compression spring surrounding said bolt and positionedbetween said part and said nut.

3. The combination of a grindin Wheel having a slot extending inwardlyrom its periphery, a hollow boss on the wheel at the inner end of saidslot, said wheel having a slot extending inwardly from said boss, a bandfitting upon the periphery of said wheel and having a loop extendinginto the first-mentioned slot, a cross pin lying in said loop, a bolthaving an eye through which said cross pin extends, said bolt extendingthrough said hollow boss and into the sec- FREDERICK N. GARDNER. FREDERIO E. GARDNER.

Wit-nesses H. U. ADAMS,

CLARA BANKIN.

